KXCKS.S SHMlLOXniCrOR HOLE rKwsroRi' 



421 



For the steady-stale curve ai)pr()ximate values of the expressions (40) and 

 (41) can be comj^uted by evaluating the derivatives of ^ with respect to v 



0.02 0.04 0.06 0.1 



0.4 0.6 1.0 



Fig. 9 — Asymptotic magnitude of diffusion terms in the steady-state flux of holes, 

 whenj// is large. 



from (29) or (31). For the case of ideal volume recombination with m-; m/. — 

 3/2 this gives, if the diffusion efTects are not too large, 



[diffusion current 

 drift current 



div. diffusion current 

 div. drift current 



'\ (I + .)(1 + 2.)(1 +^vf (42) 



(43) 



These functions are plotted in Fig. 9. From this ligure one can estimate 

 roughly when diffusion will begin to have serious effects other than a slight 

 rounding of the leading and trailing ends of the transient. Vov example, if 



